How to achieve inner join using SQLAlchemy?

Question

How to achieve inner join using SQLAlchemy ? I am trying to make simple chat

class Base(object):
    def __tablename__(self):
        return self.__name__.l         


        

Answer 1

For that you first need to have a session to make a Query. Additionally it can be convenient to have a relationship on your MessageModel.

class MessageModel(Base):
    __tablename__ = 'messages'
    player_id = Column(Integer,ForeignKey('chats.id'), nullable=False)
    message = Column(String(2000), nullable=False)
    time = Column(TIMESTAMP, server_default=func.now())
    player = relationship(PlayerModel, backref="messages")

This will create the relationship on both models.

results = (session.query(PlayerModel)
                  .join(PlayerModel.messages)
                  .values(PlayerModel.username,
                          MessageModel.message,
                          MessageModel.time))
# results will be a generator object

# This seems a bit convoluted, but here you go.
resultlist = []
for username, message, time in results:
    resultlist.append({'message': message,
                       'username': username,
                       'time': time})

There may be more elegant ways to come to your data structure but this one should work.